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StatisticsQ&A LibraryFor a 4-unit class like Statistics, students should spend average of 12 hours studyingfor the class. A survey was done on 25 students, and the distribution of total studyhours per week is bell-shaped with a mean of 13 hours and a standard deviation of 2.7hoursUse the Empirical Rule to answer the following questionsa) 68% of the students spend betweenhours andhours on Statisticseach weekhours andb) 95% of the students spend betweenhours on Statisticseach weekc) 99.7% of the students spend betweenhours andhours on Statisticseach week.Question

Asked Nov 17, 2019

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Step 1

**68-95-99.7-rule:**

Let *X *be an observation from a bell shaped distribution, having mean x-bar and sample standard deviation s, then according to the 68-95-99.7-rule, approximately 68%, 95% and 99.7% of the values lie within one, two and three standard deviations of the mean respectively. That is,

Step 2

**a.**

It is given that the distribution of total study hours per week is bell-shaped with mean 13 hours and standard deviation of 2.7 hours.

It is known that 68% of the data lies within one standard deviations of the mean.

Step 3

**b.**

It is known that 95% of the data lies within two standard deviations of the mean. ...

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